NO! There is a (very!) large difference between moles and molar. Moles has units of grams. Molar has units of moles per liter.
17 kD means there are 17 kg per MOLE. You cannot determine how many grams per liter there are without knowing how many liters.
I have no idea where your calculation came from, but you simply have insufficient information to do this calculation.

If the sample is pure, you can just do an A280 reading by Nanodrop. This will give you a reading in mg/mL. Then you can convert to g/L. The kD does not mean anything in terms of g/L. The kD is only needed to calculate the MOLARITY.